thodg/libgit2/cmake

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  • Hash : c5cd71b2
    Author : Josh Junon
    Date : 2021-12-23T18:23:34

    cmake: use PROJECT_SOURCE_DIR of CMAKE_SOURCE_DIR Also applies to *_BINARY_DIR. This effectively reverts 84083dcc8bd41332ccac9d7b537f3e254d79011c, which broke all users of libgit2 that use it as a CMake subdirectory (via `add_subdirectory()`). This is because CMAKE_SOURCE_DIR refers to the root-most CMake directory, which in the case of `add_subdirectory()` is a parent project to libgit2 and thus the paths don't make any sense to the configuration files. Corollary, CMAKE_SOURCE_DIR only makes sense if the CMake project is always the root project - which can rarely be guaranteed. In all honesty, CMake should deprecate and eventually remove CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR. It's been the source of headaches and confusion for years, they're rarely useful over CMAKE_CURRENT_(SOURCE|BINARY)_DIR or PROJECT_(SOURCE|BINARY)_DIR, and they cause a lot of confusing configuration and source code layouts to boot. Any time they are used, they break `add_subdirectory()` almost 100% of the time, cause confusing error messages, and hide subtle bugs.

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